Automated Control Model Development for the Technological Process of Sewage Sludge Anaerobic Digestion in a Bioreactor

Abstract

The article presents the research results and modeling processes conducted at the experimental site of the Department of Water Supply and Water Treatment at Kalashnikov Izhevsk State Technical University. The aim of the research is to develop a model for automating work processes in a biogas plant for anaerobic digestion based on the analysis of measurable parameters. A system for technological process automated control in the bioreactor is proposed, utilizing actuators and intelligent multi-parameter sensors capable of data exchange with a handheld personal computer (smartphone) via wireless communication. The article outlines the overall architecture of the multi-parameter intelligent sensors and compatible actuators used in monitoring and control the technological process in the bioreactor. It also presents the basic architecture of the intelligent multi-parameter sensor for the bioreactor. The research results and the structural diagram of the developed two-section biogas plant with a semi-automatic control system are provided including independent mixing devices for each section, independent substrate liquid heating systems for each section, and an electrical control panel for monitoring significant process factors. The article discusses a comparative analysis of technological processes for the organic waste disposal and presents functional diagrams for bioreactor automated operation with respect to the climate conditions of the Udmurt Republic, based on literature sources. It examines the basic connection diagrams for sensors to recording devices enabling the operator to control the technological process of organic waste disposal while regulating the temperature in the bioreactor. Technological process automation of organic waste anaerobic digestion in the bioreactor will increase the volume of biogas produced and enhance the energy efficiency of the method.